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Aluminum silicate red phosphor and preparation method thereof

A red phosphor, aluminosilicate technology, applied in chemical instruments and methods, luminescent materials, electrical components, etc., can solve the problems of weak absorption, limited application range, poor stability of fluoride, etc., and achieve strong absorption and high luminescence efficiency. Effect

Active Publication Date: 2016-11-16
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

However, from the perspective of environmental protection, the preparation of fluoride requires the use of hydrofluoric acid, which is extremely harmful to the environment. From the perspective of chemical stability, fluoride has poor stability in normal environments.
The commercialized one is 3.5MgO·0.5MgF 2 · GeO 2 :Mn 4+ , the emission peak is located at 658nm, and the excitation spectrum is located at 230-450nm. Because it has no obvious absorption in the blue light region (450-480nm), its application range is limited.
In addition, based on current research and reports, Mn 4+ Doped oxide red phosphor has much weaker absorption in the near-ultraviolet or blue light region than in the ultraviolet region, so its utilization rate of the light emitted by the LED chip is low
Peng Mingying and others [Chinese invention patents: ZL 201110265085.2, ZL 201110425704.X, ZL 201210216122.5] invented a series of Mn 4+ Doped aluminate red phosphor has the advantages of high-efficiency luminescence, low price, low temperature preparation conditions, and environmental friendliness. It is expected to be applied and promoted in white LEDs, but it also has weak absorption in the blue light region.

Method used

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  • Aluminum silicate red phosphor and preparation method thereof
  • Aluminum silicate red phosphor and preparation method thereof
  • Aluminum silicate red phosphor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Select strontium carbonate, aluminum hydroxide, silicon dioxide, manganese carbonate and boric acid as the starting compound raw materials, and weigh five kinds of compound raw materials respectively according to the molar ratio of each element, totally 8 groups, and the proportions are as follows:

[0039] (1) Sr:Al:Si:Mn:B=3:9.999:1:0.001:0.5, corresponding to x=0.01%, y=5%;

[0040] (2) Sr:Al:Si:Mn:B=3:9.998:1:0.002:0.5, corresponding to x=0.02%, y=5%;

[0041] (3) Sr:Al:Si:Mn:B=3:9.995:1:0.005:0.5, corresponding to x=0.05%, y=5%;

[0042] (4) Sr:Al:Si:Mn:B=3:9.990:1:0.010:0.5, corresponding to x=0.1%, y=5%;

[0043] (5) Sr:Al:Si:Mn:B=3:9.970:1:0.030:0.5, corresponding to x=0.3%, y=5%;

[0044] (6) Sr:Al:Si:Mn:B=3:9.950:1:0.050:0.5, corresponding to x=0.5%, y=5%;

[0045] (7) Sr:Al:Si:Mn:B=3:9.900:1:0.100:0.5, corresponding to x=1.0%, y=5%;

[0046] (8) Sr:Al:Si:Mn:B=3:9.800:1:0.200:0.5, corresponding to x=2.0%, y=5%;

[0047] The total weight of the control mixtu...

Embodiment 2

[0054] Select strontium carbonate, aluminum hydroxide, silicon dioxide, manganese carbonate and boric acid as starting compound raw materials, according to the molar ratio of each element Sr:Al:Si:Mn:B=3:9.990:1:0.010:0.5, corresponding to x =0.1%, y=5%; five kinds of compound raw materials were weighed respectively, and the total weight of the control mixture was 15 grams. After grinding and mixing 15 grams of the mixture, put it into a corundum crucible, and then put the crucible into a high-temperature electric furnace. The heating rate is precisely controlled, and the sample is pre-fired at 800°C for 5 hours. Take out the pre-fired sample, grind it again and divide it into several parts, burn it under the air at temperature T (T=1200, 1250, 1300, 1350, 1450, 1500, 1550°C) for 5 hours, take it out and grind it again Afterwards, burn again at temperature T (T=1200, 1250, 1300, 1350, 1450, 1500, 1550°C) for 5 hours in the air, and cool naturally with the furnace to obtain te...

Embodiment 3

[0056] Select strontium oxide, aluminum hydroxide, silicon dioxide, manganese oxide and boric acid as starting materials, according to the molar ratio of each element Sr:Al:Si:Mn:B=3:9.999:1:0.001:0.2, corresponding to x= 0.01%, y=2%; five kinds of raw materials were weighed respectively, and the total weight of the control mixture was 5 grams. After grinding and mixing 5 grams of the mixture, put it into a corundum crucible, and then put the crucible into a high-temperature electric furnace. The heating rate is precisely controlled, and the sample is pre-fired at 500°C for 10 hours. Take out the pre-fired sample, grind and mix it again, burn it at 1550°C for 2 hours in an oxygen atmosphere, take it out and grind it again, burn it at 1550°C for 2 hours in an oxygen atmosphere, and cool it naturally with the furnace Tetravalent manganese ion doped strontium aluminosilicate red luminescent material. X-ray diffraction analysis showed that it was Sr 3 al 10 SiO 20 crystal pha...

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Abstract

The invention discloses an aluminum silicate red phosphor. The expression formula is Sr3Al10(1-x)SiO20:10xMn4+, wherein x is larger than or equal to 0.01% and smaller than or equal to 2%. The invention further discloses a preparation method of the aluminum silicate red phosphor. The method comprises the steps that 1, raw materials are weighed according to the element mole ratio; 2, the weighed raw materials in the step 1 are ground, mixed to be uniform and presintered under the oxidizing atmosphere; 3, samples presintered in the step 2 are taken out, ground, mixed to be uniform and fired under the oxidizing atmosphere; 4, samples sintered in the step 3 are taken out, ground, mixed to be uniform and fired again under the oxidizing atmosphere. The aluminum silicate red phosphor has the advantages of being wide and intense in ultraviolet and blue light absorption, mild in preparation condition, low in cost, environmentally friendly and the like, and can be applied to the field of white light LED device preparation through combination of ultraviolet or blue light LED chip and phosphor.

Description

technical field [0001] The invention relates to luminescent materials, in particular to an aluminosilicate red fluorescent powder and a preparation method thereof. Background technique [0002] Lighting plays an important role in daily production and life. With the increasingly serious problems of resource shortage and environmental pollution, it is particularly important to develop green lighting sources. Compared with incandescent lamps, fluorescent lamps and high-pressure gas discharge lamps, white LED lighting technology has a series of advantages such as low energy consumption, high luminous efficiency, long service life, mercury-free, small size, and not easy to break, so it is gradually being paid attention to and used. Widely used in general lighting, automobile, transportation, imaging, agriculture, medicine, military and other fields. At present, the combination of LED chips and phosphor powder is mainly used to obtain white light LEDs (hereinafter referred to as ...

Claims

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Application Information

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IPC IPC(8): C09K11/64H01L33/58
CPCH01L33/58C09K11/646H01L2933/0008Y02B20/00
Inventor 彭明营李鹏飞沈钰张漳敏
Owner SOUTH CHINA UNIV OF TECH
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